A knife that spreads cold butter! 'Toastie Knife', invented by British baker Warburtons, heats up in 30 secs to 107.2*F (41.8*C) on 2 AAs after research found that is the optimum temperature to spread butter. Where can we buy it? www.dailymail.co.uk/sciencetech/article-2166029/At-Pre-heated-electric-butter-knife-spread-cold-butter-straight-bread.html#ixzz2CukSz3k6